What is the meaning of convenience?

noun

• The state of being suitable or opportune.
  • usage: "chairs arranged for his own convenience"
• The quality of being useful and convenient.
  • usage: "they offered the convenience of an installment plan"
• A toilet that is available to the public.
  • synonyms: public toilet, comfort station, public convenience, public lavatory, restroom, toilet facility, wash room
• A device or control that is very useful for a particular job.
  • synonyms: appliance, contraption, contrivance, gadget, gizmo, gismo, widget